hi my whole system volume is 7000 ltrs. for supplementing calcium and also to increase nitrate level, i am want to add calcium nitrate, but i have no idea how much concentration i should add and at what frequency w.r.t days., please guide me through it. With respect to potassium sulphate and epsom, each i am adding 2 table spoons per 1000 ltr.

May be best to provide some further information. Most balanced AP systems would not require a lot of inputs unless the fish load is limited.

(a) why do you want calcium(b) why calcium nitrate specifically(c) what is the pH of your system and how hard is it (KH/GH)(d) what is the current ammonia, nitrite and nitrate level of your system(e) how many and what type of fish do you have ?

May be best to provide some further information. Most balanced AP systems would not require a lot of inputs unless the fish load is limited.

(a) why do you want calcium(b) why calcium nitrate specifically(c) what is the pH of your system and how hard is it (KH/GH)(d) what is the current ammonia, nitrite and nitrate level of your system(e) how many and what type of fish do you have ?

are you trying to run your AP system like a hydroponic system ?

I.m thinking of adding CaNO3 cos my tilapia are 1 month old and not contributing.I have a fish tank of 900 l, 300l filter and 700l divided between 2 grow beds.I was going to add a soup spoon full.

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